EP1813920A1 - Weighing scales operating method and device - Google Patents

Abstract

The method involves determining the existence of electrostatic charges at a load (25) e.g. goods, applied to a weighing scale (104) of a weighing machine (101) using an electrostatic sensor (10). Information is fed to a measuring unit (28) with respect to the values representing the charges. The quantity of the determined charges is compared with a predefined threshold value and an action of weighing electronics is activated. An independent claim is also included for a weighing machine for executing an operating method.

Description

The invention relates to a method for operating a balance and a balance for carrying out the method.

In the precise weighing of weighing samples, it is a requirement to minimize as far as possible all factors influencing the accuracy of the weighing result. By way of example, air movements may be mentioned here, which can usually be reduced to a negligible extent by means of wind protection, or fluctuations of the ambient conditions, such as temperature or humidity, which can be eliminated, for example, by placing a balance in an air-conditioned space.

Another factor influencing the weighing result comprises the presence of electrostatic charges in the weighing chamber or in the surroundings or directly on the load to be weighed, in particular when weighing nonconductive samples or when weighing samples which are located in vessels made of non-conductive material , come to fruition. Particularly problematic is the effect of electrostatic charging when using large glass or polymer vessels in the case of determining small mass differences as a weighing task. An electrostatic charge of the balance pan itself, on which the relevant samples and / or vessels, so the load are placed, usually does not take place, since this is usually made of metal and the charges can flow through a conductive connection to the balance housing ,

An electrostatic charge of a load placed on the scale causes a potential difference between the load and the grounded parts of the balance. Due to this potential difference, a force acts between the load and, for example, the weighing chamber floor. Thus, the vertical component of this force also acts on the load cell and adds to the force generated by the load. As a result, a wrong weighing result is generated and displayed, which is undesirable especially in high-resolution scales.

Other parts of the balance, such as an existing windscreen or other areas of the housing, if they consist of non-conductive material, also charge electrostatically and act by a so-called force shunt falsifying the weighing result.

An analytical balance for weighing electrostatically charged samples describes the EP 1 106 978 A1 , The scale provided with a windshield has a device for generating an ionized air flow. This device comprises an ionization device with at least two tip electrodes, which have voltages of different sign with respect to the respective counter electrode, and a fan. The device can be activated when closing the wind protection openings and switched off after a predetermined period.

A disadvantage of the device described is that, on the one hand, the fan can generate unwanted air currents in the region of the weighing pan and, on the other hand, that a fixed predetermined amount of ionization charges is always available for neutralizing the charges, regardless of the degree of charge of the load on the weighing pan.

It is therefore an object of the present invention to provide a method and an apparatus which make it possible to design the operation of a balance, in particular in the case of the presence of electrostatic charges, according to the needs of the user.

This object is achieved with the features of the independent method claim and the independent device claim.

• Ermitteln des Vorhandenseins elektrostatischer Aufladungen vermittels des Elektrostatiksensors,
• Zuleiten der Information bezüglich des das Mass der Aufladungen kennzeichnenden Werts an die Messeinheit,
• Vergleich des das Mass der ermittelten Aufladungen kennzeichnenden Werts mit mindestens einem vordefinierbaren Schwellwert und
• Auslösen einer Aktion der Wägeelektronik.

A balance with a weighing pan for receiving a load to be weighed and with weighing electronics having a measuring unit is provided with an electrostatic sensor which is arranged such that electrostatic charges can be detected on a load applied or to be applied to the weighing pan. A method for operating the balance comprises the following method steps:

• Determining the presence of electrostatic charges by means of the electrostatic sensor,
• Supplying information regarding the value indicative of the amount of charges to the measuring unit,
• Comparison of the value characterizing the measure of the ascertained charges with at least one predefinable threshold value and
• Triggering an action of the weighing electronics.

The method offers a user of the balance the advantage that it can provide information about the presence of electrostatic charges as a factor influencing the weighing result and thus can be prevented from carrying out a weighing which causes an incorrect weighing result. This is especially true when the level of electrostatic charges exceeds a predefinable threshold. A user of the balance is given a chance to eliminate the problem of electrostatic charges in order to arrive at a correct weighing result.

It is useful not to presume the threshold as constant, but depending on the weighing task by suitable measures, be it by the use of special electronic components or by means of a program which falls back on at least one predefined stored in a memory unit threshold, the threshold value to make changeable. The latter requires the presence of a processor unit and a memory unit in the measurement unit.

Preferably, a program is then executed in the processor unit which compares the mass of the ascertained charges with at least one changeably predefined threshold value stored in the memory unit. In such a case, furthermore, the determined value can be stored in the memory unit for further processing.

In particular, by means of the electrostatic sensor in the presence of electrostatic charges whose height and / or their signs are measured and the information relating to the height and / or the sign of the charging characterizing measured value of the measuring unit are fed. The The program compares the measured value with at least one threshold value which can be variably predefined in the memory unit, triggers an action of the weighing electronics when at least one threshold value is exceeded and stores the measured value in the memory unit for further processing.

Thus, a qualitative, semiquantitative or quantitative analysis of possible electrostatic charges of the load and, if necessary, certain parts of the scale during weighing can be carried out. A qualitative evaluation involves determining the presence of electrostatic charges above a predefinable threshold. A semiquantitative analysis requires providing at least two predefinable thresholds, wherein an evaluation of the determined charge sequentially compares the value indicative of the charge with the various thresholds and then categorizes, for example, no charge, low charge, medium charge, high charge. Subsequently, the program will trigger an appropriate action of the weighing electronics in the assigned category. In a quantitative analysis, the electrostatic charge is measured and a height and / or the sign assignable measured value is processed in accordance with a program part of the program executable in the processor so that an appropriate action of the weighing electronics can take place.

In a preferred embodiment, a timer is present in the weighing electronics, wherein the processor unit can access them and the program assigns to each of the measures, in particular the height and / or the sign, the charging characterizing value, in particular the measured value, a time value and the value pair in the storage unit stores.

The balance has an output unit, in particular a display and operating unit and / or at least one light-emitting diode, optionally a printer, wherein a value and / or measured value, dependent signal, characterizing the mass, or the height and / or the sign of the charge is output at the output unit and thus brought to the attention of the user of the balance. In particular, this can be asked to trigger an action of the weighing electronics. Often, however, it is an advantage that the program can Measured value, the action of the weighing electronics is controlled and this action takes place automatically.

In an advantageous development, the scale has an ionization device, wherein when a predefined threshold value is exceeded, the ionization device is set in motion by the value characterizing the quantity, in particular the height and / or the sign, the charge, in particular the measured value.

It is also conceivable and desirable to store the data on the duration and intensity of the activity of the ionization device in the storage unit, wherein they can be called up at any time via an output unit of the balance.

The activity of the ionization device, in particular the duration and / or the intensity of the ionization, can take place in accordance with the size of the value characterizing the charge, in particular the measured value.

In a further development of the method, the mass, in particular the height and / or the sign, the charge is determined again after the ionization and the value, in particular the measured value, the measuring unit supplied, after which the duration and / or the intensity of ionization to the new Value is adjusted and the sequence of ascertaining the amount of charging and subsequent ionization is repeated until the value characterizing the degree of charging has fallen below a predefined threshold value.

There may also be a moisture sensor for determining the humidity and the information relating to the value of the humidity indicative of the measuring unit, the program modifies the activity of the ionization device according to the measure of humidity.

In a special embodiment of the balance, which has a weighing chamber surrounding the weighing pan, which is enclosed by a windscreen device, and wherein the windbreaking device has at least one opening closable by a wall for access to the weighing room, a further advantageous method step is that the electrostatic sensor when pressing the Wall electrostatic charges of the load already determined during the introduction of the same in the weighing room.

In the event that a code reader is present and that the container containing the weighing material has a code which provides information about the material of the vessel, a program part can be executed in the program, which modifies the activity of the ionization device according to the vessel material.

A balance for carrying out the method described above has a weighing pan and a weighing electronics, the latter having a measuring unit. There is an electrostatic sensor which is arranged such that electrostatic charges of a load applied or to be applied to the weighing pan can be determined. The electrostatic sensor is in communication with the measuring unit, whereby an action of the weighing electronics can be triggered when a charge has been detected that exceeds at least one predefinable threshold value.

Such a scale ensures a user more security. In particular, the latter does not always have to consider a falsification of the weighing result caused by possible electrostatic charging of the load, since the measures initiated contribute to eliminating this problem.

Preferably, the measuring unit of the scale is provided with a processor and a memory unit, wherein in the processor of the measuring unit, a program is executable, which triggers an action of the weighing electronics when detected, beyond at least one predefinable threshold charging extends and / or the measured value for further processing in the storage unit stores.

In a special embodiment of the balance, an ionization device is present, which can be activated in the case of existing electrostatic charges and / or can be controlled by the measuring unit in accordance with the determined charging of the load.

In a preferred embodiment of the balance, this has a weighing pan surrounding the weighing chamber, which is enclosed by a windbreaker. The wind protection device comprises at least one wall which can close an opening for access to the weighing chamber, wherein at least one sensor element of the at least one electrostatic sensor is arranged in the immediate vicinity of the closable opening. Advantageously, the at least one ion source of the ionization device and / or at least one sensor element of the at least one electrostatic sensor can be arranged in the immediate vicinity of the at least one opening of the windshield device.

In a preferred embodiment, the windscreen device of the balance has at least one fixed wall, which is provided with recesses. The at least one ion source of the ionization device and / or at least one sensor element of the at least one electrostatic sensor are arranged in these recesses.

In particular, the scale has a scale housing accommodating a load cell and the weighing electronics, one wall of which forms a stationary wall of the windshield device, guide shafts opening into the recesses on the balance housing, in which feed lines to the sensor element of the electrostatic sensor and / or supply lines to the ion source the ionization device are arranged. Alternatively, the guide shafts can be formed more extensive and it can be housed electronic components of the electrostatic sensor and / or the ionization device therein.

In a preferred development of the scale, an output unit, in particular at least one light-emitting diode and / or a display unit and / or a printer is present for the semi-quantitative display of an electrostatic charge and / or for outputting a measured value characterizing the magnitude and / or the sign of the charge.

Figur 1

eine Waage mit einer Windschutzvorrichtung in dreidimensionaler Darstellung, mit einem Sensorelement eines Elektrostatiksensors und mit zwei Ionenquellen einer Ionisationsvorrichtung;

Figur 2

eine Waage mit einer Windschutzvorrichtung in dreidimensionaler Darstellung, mit zwei Sensorelementen mindestens eines Elektrostatiksensors und mit zwei Ionenquellen einer Ionisationsvorrichtung;

Figur 3

eine Variante der Anordnung der gemäss Figur 2 gezeigten Sensorelemente und der Ionenquellen in einer Ausschnittvergrösserung;

Figur 4

eine weitere Variante der Anordnung der gemäss Figur 2 gezeigten Sensorelemente und der Ionenquellen in einer Ausschnittvergrösserung;

Figur 5

ein Beispiel eines Elektrostatiksensors als Schaltschema;

Figur 6

eine Waage mit einem Elektrostatiksensor und mit einer Ionisationsvorrichtung als Blockdiagramm dargestellt;

Figur 7

ein Flussdiagramm, zur Darstellung des Zusammenwirkens von Elektrostatiksensor und Ionisationsvorrichtung

The inventive scale and the method for determining the presence of electrostatic charges in the weighing room of a balance illustrated and described below with reference to the highly schematic drawings. Show it:

FIG. 1

a scale with a windbreaker in three-dimensional representation, with a sensor element of an electrostatic sensor and with two ion sources of an ionization device;

FIG. 2

a scale with a windscreen device in three-dimensional representation, with two sensor elements of at least one electrostatic sensor and with two ion sources of an ionization device;

FIG. 3

a variant of the arrangement of the sensor elements shown in Figure 2 and the ion sources in a detail enlargement;

FIG. 4

a further variant of the arrangement of the sensor elements shown in Figure 2 and the ion sources in a cut-out magnification;

FIG. 5

an example of an electrostatic sensor as a circuit diagram;

FIG. 6

a scale with an electrostatic sensor and with an ionization device shown as a block diagram;

FIG. 7

a flow chart illustrating the interaction of the electrostatic sensor and ionization device

In the figure 1, a balance 1 is shown in three-dimensional representation. This balance 1 has a wind protection device 2, which encloses a weighing chamber 3, wherein a weighing pan 4 is located in the weighing chamber 3. The weighing pan 4 is in a known manner with a located in the housing 7 of the balance 1 and therefore not visible here load cell by means of a through the weighing chamber floor 30 through reaching linkage (also not visible here). On the weighing pan 3 is a container 5 with weighing 6. The container 5 is made of polymer material, such as polyethylene or polypropylene, the sample can be 6, for example, a powder, which in a laboratory before its use must be weighed. Due to the electrically insulating properties of both the container 5 and the weighing material 6, both can be electrostatically charged and then exert an electrostatic force on the weighing pan 4 in addition to the force acting through their mass. This falsifies the weighing result.

In order to determine the mass and / or the amount of charging of the container 5 located on the weighing pan 3, together with the item to be weighed 6, an electrostatic sensor 10 is mounted near the weighing pan 4 on the rear wall 9. Of the electrostatic sensor 10, the sensor element 18 can essentially be seen in a surround 35 in FIG. This electrostatic sensor 10, which will be described in greater detail below with reference to FIG. 5, detects electrostatic charges in the weighing chamber 3, which in the example shown preferably accumulate on the load on the weighing pan 4 consisting of container 5 and weighing product 6. The signal corresponding to the electrostatic charge is forwarded by the sensor 10 to the weighing electronics housed in the housing 7 and therefore also not visible in the figure 1, which processed in the processor of a measuring unit this depending on the distance between the load 5, 6 and electrostatic sensor 10 and appropriate measures set in motion.

The balance 1 has a display and control unit 11, which in the illustration according to FIG. 1 has a screen 12, preferably a touch-screen screen. On this an indication of the mass of the charge, which was determined by the electrostatic sensor 10, take place.

The presence of electrostatic charges in the weighing chamber 3 can now either be represented qualitatively by means of a symbol on the screen 12. However, it can also semiquantitatively the degree of charging eg the load located on the balance pan 3 are displayed, for example by means of color representation on the screen the presence of a low charge by the color white and the presence of a high charge is symbolized by the color red, at least an intermediate value could be characterized by the color yellow or orange. A quantitative indication of the measured amount of charge on the screen 12 is of course also conceivable. However, in this case is with Advantage of the distance between the electrostatic sensor 10 and container 5 an additional size that must be determined and is included in the calculation of the amount of charge. The sign of the charges can also be detected and displayed by the electrostatic sensor 10.

The reference numeral 13 are also in a recess 8 in the rear wall 9 of the balance 1 right and left each arranged an ion source of an ionization device. The ion source 13 is also located in an enclosure 36. This ionization device is set in the case of a proven electrostatic charge before the weighing process in motion, that is activated, so that it can then be done without distorting force shunt due to electrostatic forces.

The ion sources 13 of the ionization device are preferably accommodated in laterally arranged recesses 8 of the rear wall 9. These recesses, which are closed when not in use by means of a clip 14, allow access to the weighing chamber from the outside, even if all the walls 17 of the windbreaker 2 are closed. The recesses 8 are easily accessible from the outside, since the width of the balance housing 7 is less than that of the rear wall 9. On the outside of the balance housing 7 guide shafts 15 are mounted, in which the not visible here leads to the ion source 13 are arranged and the corresponding electronics are supplied.

FIG. 2 shows the scale of FIG. 1 in an analogue representation, wherein two sensor elements 18 of at least one electrostatic sensor 10 are arranged in a respective recess 8 provided on the right and left in the rear wall 9 of the balance 1. The ion sources 13 of the ionization device are housed in further recesses 8 like those shown in FIG. On the outside of the balance housing 7 guide shafts 15 are mounted, in which the not visible here leads of the electrostatic sensor 10 and the ion source 13 are arranged and the corresponding electronics are supplied. The two accommodated in the recesses 8 sensor elements 18 of the at least one electrostatic sensor 10 can now already when introducing the load in the weighing chamber 3 by an open side wall 17, the presence of electrostatic Detecting charges on the load, in which case immediately the ionization device can be set in motion.

FIGS. 3 and 4 each show in a detail enlargement according to FIG. 2 a wall of the balance housing 7, to which different embodiments of the guide shafts 15, 15 'are attached. While a guide shaft 15 (according to FIG. 3) is only suitable for guiding the supply lines, electronic components 16 can also be accommodated in a guide shaft 15 '(according to FIG. 4), for example those for controlling the ion source 13 as part of the ionization device and / or The measuring electronics of the electrostatic sensor 10. It should be noted that the ion source 13 and the sensor element 18 are reversed in the illustration according to Figures 3 and 4 with respect to that of Figure 2. This shows that different positions within the weighing chamber 3 are possible for the respective arrangement of the ion source 13 or of the sensor element 18. For example, it is preferable if a sensor element 18 is positioned in the immediate vicinity of the weighing pan 4, but without mechanical contact therewith. One, two or more sensor elements 18 and / or electrostatic sensors 10 may be present. An ion source 13 of the ionization apparatus is preferably mounted close to the side wall 17 which is displaceable for opening and closing the weighing chamber 3. Again, more than one, preferably two, ion sources 13 may be present.

As can be seen from FIGS. 1 to 4, the ion sources 13 are preferably located close to the respective side wall 17 of the windshield device 2, it is advantageous if these are activated as soon as such a wall 17 is opened, so that already during insertion into the weighing chamber 3, the container 5 and the sample 6 are freed from electrostatic charges.

5 shows the circuit diagram of an electrostatic sensor 10. This is based on the principle of the detection of Influenzladungen and has a flat sensor electrode as a sensor element 18. The measurement signal is displayed by means of an integration stage 19, a magnitude converter stage 20 and a comparator stage 21. About the integration stage 19, a switching element 22 is placed, by means of which after the measurement or an action taken by the Weighing electronics, manually or automatically the measurement signal is reset. In the comparator stage 21, the integrated absolute value of the measuring signal is compared with at least one threshold value. Subsequently, either on the screen 12 of the display and control unit 11 or by means of a light emitting diode a user of the balance are displayed, that the load, such as the container 5 and / or the weighing material 6 has an electrostatic charge above a predetermined threshold. In addition, an action, which is preferably controlled by the weighing electronics, are triggered. Such an action is, for example, the activation of an ionization device, which introduces electric charges for neutralizing the electrostatic charge into the weighing chamber 3 over a predefined period of time.

It goes without saying that the comparator stage 21 does not have to have just one single comparison unit. Rather, the comparator stage 21 shown schematically in FIG. 4 is representative of such having one or more comparison units with different predetermined threshold values, for example three threshold values, so that semiquantitative detection of the electrostatic charge can take place. In accordance with an exceeding of one of the three threshold values, the strength and / or the duration of the ejection of the ionization device is adjusted. Upon determination of the sign of the electrostatic charges, the sign of the ions to be generated by the ionization device can also be specified.

Further actions of the balance 1 can be carried out alternatively or additionally to the activation of the ionization device. For example, at a detected above one of the higher thresholds electrostatic charge a warning signal can be issued and / or any further weighing be blocked.

Of course, other principles of detection of electrostatic charges can be used. In particular, reference is made in this connection to the principle of the field mill.

In the figure 6 is a highly schematic block diagram of a balance 101 with an electrostatic sensor 10, as shown for example in Figure 5, and with a Ionization device 23 shown. The balance 101, which has no wind protection device here, is provided with a weighing pan 104, on which the load, shown here as any weighing object 25 without a container, is applied. Furthermore, the scale 101 has a weighing cell 26 and a weighing electronics 27. The electrostatic sensor 10 has a sensor electrode as a sensor element 18 and a sensor electronics 24, which includes the integration stage 19, magnitude converter stage 20 and comparator stage 21 described in FIG. 5, but can also be configured in another, basically known, embodiment. Both the sensor electronics 24 and the ionization device 23 are connected to the weighing electronics 27 of the scale 101. As a result, the information about the amount of the electrostatic charge can be transmitted to a measuring unit 28 of the weighing electronics 27. In the measuring unit 28, these data are stored in a memory unit 29. In a processor unit 37 of the measuring unit 28, a program is executed which activates the ionization device 23 when threshold values are exceeded. Therefore, the ionization device 23 is also in connection with the weighing electronics 27. The threshold values can be modified via an input device 31, for example the display and operating unit 11. A measure of the electrostatic charge characterizing output can either be done on the screen 12 of the display and control unit 11 or by means of optical displays, such as the LEDs 32, 33, 34, which signal with different colors exceeding a predetermined threshold.

FIG. 7 shows in a flowchart a method for operating the balance 1, 101 with regard to the detection and removal of electrostatic charges in the vicinity of the weighing pan 4, 104 and / or the load. By means of the electrostatic sensor 10, the presence of the charge is determined and by means of a comparator stage, which can be part of the measuring unit in principle as a comparator unit, the height and / or the sign of the charge is determined. The result is displayed and it is clarified whether an action of the balance 1, 101, ie an activation of the ionization device 23 is necessary, in particular in what strength and possibly also with what sign the ionization of the weighing pan 4, 104 and / or the load surrounding air. If there is a need to neutralize the electrostatic charge, the ionization device 23 is activated. In the event that there is no such need, the corresponding indication is cleared and the weighing process can be started. After ionization, which is adapted in its extent and in its duration to the determined electrostatic charge, the weighing process is also started and the display is cleared.

If, after successful ionization, the measure of charging still above a threshold value is determined, the duration and / or the intensity of the ionization is adapted to this new value or measured value in accordance with the renewed determination of the charges, and the result of determining the amount of charge and subsequent charge Ionization is repeated until this value or measured value has fallen below a predefined threshold value.

The invention has been shown and described with reference to the embodiments illustrated in FIGS. It goes without saying that further embodiments of the method and the device which are not described here do justice to the essence of the invention. In particular, in the weighing electronics, the triggering of an action, in particular an activation of the ionization device after the presence of electrostatic charges has been established, can be realized by means of an analog circuit.

LIST OF REFERENCE NUMBERS

1, 101

Libra

2

Wind protection device

3

Weighing space

4, 104

pan

5

container

6

Place sample

7

Housing, balance housing

8th

recess

9

rear wall

10

Electrostatic sensor

11

Display and control unit

12

screen

13

ion source

14

clip

15, 15 '

guide shaft

16

Electronic Components

17

Side wall

18

sensor element

19

integration level

20

Amount converter stage

21

comparator

22

switching element

23

ionization

24

sensor electronics

25

weighing object

26

load cell

27

Weighing Electronics

28

measuring unit

29

storage unit

30

weighing chamber base

31

input device

32

led

33

led

34

led

35

Mount of the sensor element

36

Mount of the ion source

37

processor unit

Claims (23)

Method for operating a balance (1, 101) with a weighing pan (4, 104) for receiving a load (5, 6, 25) to be weighed, with weighing electronics (27) having a measuring unit (28), and with an electrostatic sensor ( 10), which is arranged such that electrostatic charges can be detected on a load (5, 6, 25) applied or to be applied to the weighing pan (4, 1'04), characterized in that The presence of electrostatic charges is determined by means of the electrostatic sensor (10), The information relating to the value of the charge indicative value is supplied to the measuring unit (28), Wherein the measure of the ascertained charges is compared with at least one predefinable threshold, and • an action of the weighing electronics (27) is triggered. A method according to claim 1, characterized in that the measuring unit (28) comprises a processor unit (37) and a memory unit (29), in which processor unit (37) a program is executed, which measures the detected charges with at least one in the memory unit (29) variable predefined threshold compares. Method according to claim 1 or 2, characterized in that the measuring unit (28) has a memory unit (29) and the determined value is stored in the memory unit (29) for further processing. A method according to claim 2 or 3, characterized in that by means of the electrostatic sensor (10) in the presence of electrostatic charges whose height and / or their signs is measured, the information relating to the height and / or the sign of the charging characteristic measurement value of the measuring unit (28 ), the Program compares the measured value with at least one threshold value changeably predefined in the memory unit (29), triggers an action of the weighing electronics (27) when at least one threshold value is exceeded and stores the measured value in the memory unit (29) for further processing. Method according to one of Claims 2 to 4, characterized in that a timer is present in the weighing electronics (27), the processor unit (37) being able to access the latter and the program assigning to each program the dimension, in particular the height and / or the sign, assigning the charging characterizing value, in particular the measured value, a time value and stores the value pair in the memory unit (29). Method according to one of claims 1 to 5, characterized in that the balance (1, 101) an output unit, in particular a screen (12) of a display and control unit (11) and / or at least one light-emitting diode (32, 33, 34) and / or having a printer, wherein a value indicative of the mass, in particular the height and / or the sign, of the charging value or measured value, dependent signal is output to the output unit. Method according to one of claims 1 to 6, characterized in that the balance (1, 101) an output unit, in particular a screen (12) of a display and control unit (11) and / or at least one light-emitting diode (32, 33, 34) and / or a printer, wherein by means of the output unit, a warning is displayed, which informs a user of the balance (1, 101) of the presence of electrostatic charges and asks him to trigger an action of the weighing electronics (27). Method according to one of Claims 2 to 6, characterized in that the action of the weighing electronics (27) is controlled by means of the program on the basis of the value or measured value characterizing the dimension, in particular the height and / or the sign, of the charging. Method according to one of Claims 1 to 8, characterized in that the balance (1, 101) has an ionization device (23) which, when a predefinable threshold value is exceeded, characterizes the charge, in particular the height and / or the sign, of the charge Value, in particular the measured value, the ionization device (23) is set in motion. A method according to claim 9, characterized in that the activity of the ionization device (23), in particular the duration and / or the intensity of the ionization according to the Mass, in particular the height and / or the sign of the charge characterizing value, in particular the measured value, he follows. A method according to claim 9 or 10, characterized in that after the ionization measure, in particular the height and / or the sign, the charge, the charge is determined again and the value, in particular the measured value of the measuring unit (28) is supplied, after which the duration and / or the intensity of the ionization to the new value, or measured value is adjusted and the sequence of determining the amount of charge and subsequent ionization is repeated until the value, in particular the measured value has dropped below a predefined threshold value. Method according to one of claims 9 to 11, characterized in that a humidity sensor for determining the humidity is present and that the information relating to the value of the humidity of the measuring unit (28) is fed, and that the program the activity of the ionization device ( 23) modified according to the degree of humidity. Method according to one of Claims 1 to 12, characterized in that the balance (1, 101) has a weighing chamber (3) which surrounds the weighing pan (4, 104) and which is surrounded by a windbreaking device (2), the windbreaking device ( 2) at least one through a wall (17) has lockable opening for access to the weighing chamber (3), and that the electrostatic sensor (10) upon actuation of the wall (17) determines electrostatic charges of the load (5, 6, 25) when introduced into the weighing chamber (3). Method according to one of claims 9 to 13, characterized in that a code reader is present and that the weighing material (6) containing vessel (5) has a code which gives information about the material of the vessel (5) and that in the program Program part is executed, which modifies the activity of the ionization device (23) according to the vessel material. Scales (1, 101) for carrying out the method according to one of claims 1 to 14 with a weighing pan (4, 104), with weighing electronics (27) having a measuring unit (28), characterized in that at least one electrostatic sensor (10 ), which is arranged such that electrostatic charges of a on the pan (4, 104) applied or applied load (5, 6, 25) can be determined, is present, which electrostatic sensor (10) with the measuring unit (28) is in communication In the case of ascertained charging that exceeds at least one predefinable threshold value, an action of the weighing electronics (27) can be triggered. Scales (1, 101) according to claim 15, characterized in that the measuring unit (28) comprises a processor unit (37) and a memory unit (29), wherein in the processor unit (37) a program is executable, the at least one initiates an action of the weighing electronics (27) and / or stores the measured value in the memory unit (29) for further processing. Scales (1, 101) according to claim 15 or 16, characterized in that an ionization device (23) is present, which can be activated in accordance with the ascertained charges of the load (5, 6, 25) and / or that of the measuring unit (28) the determined charges of the load (5, 6, 25) is controllable. Scales (1, 101) according to claim 15, 16 or 17, characterized in that it comprises a weighing pan (4, 104) surrounding the weighing chamber (3), which is enclosed by a wind protection device (2), wherein the wind protection device (2 ) at least one through a wall (17) closable opening for access to the weighing chamber (3), wherein at least one sensor element (18) of the at least one electrostatic sensor (10) in the immediate vicinity of the at least one closable opening of the windshield (2) is arranged , Scales (1, 101) according to one of claims 15 to 18, characterized in that it comprises a weighing pan (4, 104) surrounding the weighing chamber (3), which is enclosed by a wind protection device (2), wherein the wind protection device (2 ) has at least one opening for access to the weighing chamber (3), which can be closed by a wall (17), and that there is an ionisation device (23) which has at least one ion source (13), the at least one ion source (13) of the ionisation device (23) in the immediate vicinity of the at least one closable opening of the windshield device (2) is arranged. Scales (1, 101) according to claim 18 or 19, characterized in that the wind protection device (2) at least one fixed wall (9) which is provided with recesses (8), in which the at least one ion source (13) of the ionization device (23) and / or at least one sensor element (18) of the at least one electrostatic sensor (10) is arranged. A balance (1, 101) according to claim 20, characterized in that it comprises a weighing housing (7) serving to accommodate a weighing cell (26) and the weighing electronics (27), one wall of which houses the fixed wall (9) of the windbreaking device (2). forms, wherein on the balance housing (7) into the recesses (8) opening guide shafts (15) are arranged, in which supply lines to the sensor element (18) of the electrostatic sensor (10) and / or leads to the ion source (13) of the ionization device (23) are. Scales (1, 101) according to claim 20, characterized in that it comprises a housing of a weighing cell (26) and the weighing electronics (27) serving balance housing (7), one wall of which forms the fixed wall (9) of the windscreen device (2) , wherein on the balance housing (7) into the recesses (8) opening guide shafts (15 ') are arranged, in which electronic components (16) of the electrostatic sensor (10) and / or the ionization device (23) are housed. Balance (1, 101) according to one of claims 15 to 22, characterized in that an output device, in particular at least one light-emitting diode (32, 33, 34) and / or a display unit (12) and / or a printer is present for semiquantitative display a value indicative of the degree of electrostatic charging and / or the output of a measured value characterizing the magnitude and / or the sign of the charging.

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